Migraine is the most common cause of episodic headache.
Worldwide, migraine affects about 15–20% of women, and about 5–10% of men.
In approximately 90% of cases, the onset is before 40 years of age.
Episodes of headache are associated with sensitivity to light, sound, or movement.
In addition, these symptoms may be associated with nausea and vomiting.
Severity of a migraine headache varies among individuals.
Migraine is usually high impact, with inability to function normally during episodes.

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